The advantages and disadvantages of the cut-off valve

Close parts (disc) is moved along the seat centerline valve. According to this mobile form of the valve, the valve seat port change is proportional to the valve stroke. Since the type of valve stem to open or close the relatively short trip, but a very reliable cut-off function, but also due to the change of the seat port valve stroke is proportional to, is very suitable for the regulation of traffic. Therefore, this type of valve is moved together as a cutting or adjust, as well as with a throttle.angle seat valve
Advantages:
(1) in the opening and closing process, due to the friction between the valve flap and valve sealing surface is smaller than the gate, and therefore wear.
(2) opening height is typically only 1/4 of the seat channel, so much smaller than the gate;
③ usually the only one on the valve body and valve sealing surface, and thus better manufacturability, ease of maintenance.
(4) because of the filler is generally a mixture of asbestos and graphite, high temperature levels. The general steam valve with shut-off valve.
Disadvantages:
① changed due to the direction of flow of the medium through the valve, so the minimum flow resistance of the shut-off valve is higher than most other types of valves;
(2) due to the longer stroke, open the ball valve and slow speed.pneumatic accessory